A Treatise Concerning the Principles of Human Knowledge by George Berkeley. - HTML preview

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sense varies. The extension therefore which exists without the

mind is neither great nor small, the motion neither swift nor slow,

that is, they are nothing at all. But, say you, they are extension

in general, and motion in general: thus we see how much the tenet

of extended movable substances existing without the mind depends on

the strange doctrine of ABSTRACT IDEAS. And here I cannot but remark how

nearly the vague and indeterminate description of Matter or corporeal

substance, which the modern philosophers are run into by their own

principles, resembles that antiquated and so much ridiculed notion of

MATERIA PRIMA, to be met with in Aristotle and his followers. Without

extension solidity cannot be conceived; since therefore it has been shown

that extension exists not in an unthinking substance, the same must also

be true of solidity.

12. That NUMBER is entirely THE CREATURE OF THE MIND, even though the

other qualities be allowed to exist without, will be evident to whoever

considers that the same thing bears a different denomination of number as

the mind views it with different respects. Thus, the same extension is

one, or three, or thirty-six, according as the mind considers it with

reference to a yard, a foot, or an inch. Number is so visibly relative,

and dependent on men's understanding, that it is strange to think how any

one should give it an absolute existence without the mind. We say one

book, one page, one line, etc.; all these are equally units, though some

contain several of the others. And in each instance, it is plain, the

unit relates to some particular combination of ideas arbitrarily put

together by the mind.

13. UNITY I know some will have to be A SIMPLE OR

UNCOMPOUNDED IDEA,

accompanying all other ideas into the mind. That I have any such idea

answering the word UNITY I do not find; and if I had, methinks I could

not miss finding it: on the contrary, it should be the most familiar to

my understanding, since it is said to accompany all other ideas, and to

be perceived by all the ways of sensation and reflexion.

To say no more,

it is an ABSTRACT IDEA.

14. A THIRD ARGUMENT AD HOMINEM.--I shall farther add, that, after

the same manner as modern philosophers prove certain sensible

qualities to have no existence in Matter, or without the mind,

the same thing may be likewise proved of all other sensible qualities

whatsoever. Thus, for instance, it is said that heat and cold are

affections only of the mind, and not at all patterns of real beings,

existing in the corporeal substances which excite them, for that

the same body which appears cold to one hand seems warm to another.

Now, why may we not as well argue that figure and extension are not

patterns or resemblances of qualities existing in Matter, because to the

same eye at different stations, or eyes of a different texture at the

same station, they appear various, and cannot therefore be the images of

anything SETTLED AND DETERMINATE WITHOUT THE MIND?

Again, it is proved

that SWEETNESS is not really in the sapid thing, because the thing

remaining unaltered the sweetness is changed into bitter, as in case of a

fever or otherwise vitiated palate. Is it not as reasonable to say that

MOTION is not without the mind, since if the succession of ideas in the

mind become swifter, the motion, it is acknowledged, shall appear slower

without any alteration in any external object?

15. NOT CONCLUSIVE AS TO EXTENSION.--In short, let any one consider

those arguments which are thought manifestly to prove that colours

and taste exist only in the mind, and he shall find they may with

equal force be brought to prove the same thing of extension, figure,

and motion. Though it must be confessed this method of arguing

does not so much prove that there is no extension or colour in

an outward object, as that we do not know by SENSE which is the TRUE

extension or colour of the object. But the arguments foregoing plainly

show it to be impossible that any colour or extension at all, or other

sensible quality whatsoever, should exist in an UNTHINKING subject

without the mind, or in truth, that there should be any such thing as an

outward object.

16. But let us examine a little the received opinion.--

It is said

EXTENSION is a MODE or accident OF MATTER, and that Matter is the

SUBSTRATUM that supports it. Now I desire that you would explain to me

what is meant by Matter's SUPPORTING extension. Say you, I have no idea

of Matter and therefore cannot explain it. I answer, though you have no

positive, yet, if you have any meaning at all, you must at least have a

relative idea of Matter; though you know not what it is, yet you must be

supposed to know what relation it bears to accidents, and what is meant

by its supporting them. It is evident SUPPORT cannot here be taken in

its usual or literal sense--as when we say that pillars support a

building; in what sense therefore must it be taken?

[Note.]

[Note: "For my part, I am not able to discover any sense at all that can

be applicable to it."--Edit 1710.]

17. PHILOSOPHICAL MEANING OF "MATERIAL SUBSTANCE"

DIVISIBLE INTO TWO

PARTS.--If we inquire into what the most accurate philosophers declare

themselves to mean by MATERIAL SUBSTANCE, we shall find them acknowledge

they have no other meaning annexed to those sounds but the idea of BEING

IN GENERAL, together WITH THE RELATIVE NOTION OF ITS

SUPPORTING

ACCIDENTS. The general idea of Being appeareth to me the most abstract

and incomprehensible of all other; and as for its supporting accidents,

this, as we have just now observed, cannot be understood in the common

sense of those words; it must therefore be taken in some other sense, but

what that is they do not explain. So that when I consider the TWO PARTS

or branches which make the signification of the words MATERIAL SUBSTANCE,

I am convinced there is no distinct meaning annexed to them. But why

should we trouble ourselves any farther, in discussing this material

SUBSTRATUM or support of figure and motion, and other sensible qualities?

Does it not suppose they have an existence without the mind? And is not

this a direct repugnancy, and altogether inconceivable?

18. THE EXISTENCE OF EXTERNAL BODIES WANTS PROOF.--But, though it

were possible that solid, figured, movable substances may exist

without the mind, corresponding to the ideas we have of bodies,

yet HOW IS IT POSSIBLE FOR US TO KNOW THIS? Either we must know it by

sense or by reason. As for our senses, by them we have the knowledge ONLY

OF OUR SENSATIONS, ideas, or those things that are immediately perceived

by sense, call them what you will: but they do not inform us that things

exist without the mind, or unperceived, like to those which are

perceived. This the materialists themselves acknowledge.

It remains

therefore that if we have any knowledge at all of external things, it

must be by REASON, inferring their existence from what is immediately

perceived by sense. But what reason can induce us to believe the

existence of bodies without the mind, from what we perceive, since the

very patrons of Matter themselves do not pretend there is ANY NECESSARY

CONNEXION BETWIXT THEM AND OUR IDEAS? I say it is granted on all hands

(and what happens in dreams, phrensies, and the like, puts it beyond

dispute) that IT IS POSSIBLE WE MIGHT BE AFFECTED WITH

ALL THE IDEAS WE

HAVE NOW, THOUGH THERE WERE NO BODIES EXISTING WITHOUT

RESEMBLING THEM.

Hence, it is evident the supposition of external bodies is not necessary

for the producing our ideas; since it is granted they are produced

sometimes, and might possibly be produced always in the same order, we

see them in at present, without their concurrence.

19. THE EXISTENCE OF EXTERNAL BODIES AFFORDS NO

EXPLICATION OF THE

MANNER IN WHICH OUR IDEAS ARE PRODUCED.--But, though we might possibly

have all our sensations without them, yet perhaps it may be thought

EASIER to conceive and explain the MANNER of their production,

by supposing external bodies in their likeness rather than otherwise;

and so it might be at least probable there are such things as bodies

that excite their ideas in our minds. But neither can this be said;

for, though we give the materialists their external bodies, they

by their own confession are never the nearer knowing how our ideas

are produced; since they own themselves unable to comprehend in

what manner BODY CAN ACT UPON SPIRIT, or how it is possible it should

imprint any idea in the mind. Hence it is evident the production of ideas

or sensations in our minds can be no reason why we should suppose Matter

or corporeal substances, SINCE THAT IS ACKNOWLEDGED TO

REMAIN EQUALLY

INEXPLICABLE WITH OR WITHOUT THIS SUPPOSITION. If therefore it were

possible for bodies to exist without the mind, yet to hold they do so,

must needs be a very precarious opinion; since it is to suppose, without

any reason at all, that God has created innumerable beings THAT ARE

ENTIRELY USELESS, AND SERVE TO NO MANNER OF PURPOSE.

20. DILEMMA.--In short, if there were external bodies, it is impossible we

should ever come to know it; and if there were not, we might have the very

same reasons to think there were that we have now.

Suppose--what no one

can deny possible--an intelligence without the help of external bodies, to

be affected with the same train of sensations or ideas that you are,

imprinted in the same order and with like vividness in his mind. I ask

whether that intelligence has not all the reason to believe the

existence of corporeal substances, represented by his ideas, and exciting

them in his mind, that you can possibly have for believing the same

thing? Of this there can be no question--which one consideration were

enough to make any reasonable person suspect the strength of whatever

arguments be may think himself to have, for the existence of bodies

without the mind.

21. Were it necessary to add any FURTHER PROOF AGAINST

THE EXISTENCE OF

MATTER after what has been said, I could instance several of those errors

and difficulties (not to mention impieties) which have sprung from that

tenet. It has occasioned numberless controversies and disputes in

philosophy, and not a few of far greater moment in religion. But I shall

not enter into the detail of them in this place, as well because I think

arguments A POSTERIORI are unnecessary for confirming what has been, if I

mistake not, sufficiently demonstrated A PRIORI, as because I shall

hereafter find occasion to speak somewhat of them.

22. I am afraid I have given cause to think I am needlessly prolix in

handling this subject. For, to what purpose is it to dilate on that which

may be demonstrated with the utmost evidence in a line or two, to any one

that is capable of the least reflexion? It is but looking into your own

thoughts, and so trying whether you can conceive it possible for a sound,

or figure, or motion, or colour to exist without the mind or unperceived.

This easy trial may perhaps make you see that what you contend for is a

downright contradiction. Insomuch that I am content to put the whole upon

this issue:--If you can but CONCEIVE it possible for one extended movable

substance, or, in general, for any one idea, or anything like an idea, to

exist otherwise than in a mind perceiving it, I shall readily give up the

cause. And, as for all that COMPAGES of external bodies you contend for,

I shall grant you its existence, THOUGH (1.) YOU CANNOT

EITHER GIVE ME ANY

REASON WHY YOU BELIEVE IT EXISTS [Vide sect. lviii.], OR

(2.) ASSIGN ANY

USE TO IT WHEN IT IS SUPPOSED TO EXIST [Vide sect. lx.].

I say, the bare

possibility of your opinions being true shall pass for an argument that

it is so. [Note: i.e. although your argument be deficient in the two

requisites of an hypothesis.--Ed.]

23. But, say you, surely there is nothing easier than for me to imagine

trees, for instance, in a park, or books existing in a closet, and nobody

by to perceive them. I answer, you may so, there is no difficulty in it;

but what is all this, I beseech you, more than framing in your mind

certain ideas which you call BOOKS and TREES, and the same time omitting

to frame the idea of any one that may perceive them? BUT

DO NOT YOU

YOURSELF PERCEIVE OR THINK OF THEM ALL THE WHILE? This therefore is

nothing to the purpose; it only shows you have the power of imagining or

forming ideas in your mind: but it does not show that you can conceive it

possible the objects of your thought may exist without the mind. To make

out this, IT IS NECESSARY THAT YOU CONCEIVE THEM

EXISTING UNCONCEIVED OR

UNTHOUGHT OF, WHICH IS A MANIFEST REPUGNANCY. When we do our utmost to

conceive the existence of external bodies, we are all the while only

contemplating our own ideas. But the mind taking no notice of itself, is

deluded to think it can and does conceive bodies existing unthought of or

without the mind, though at the same time they are apprehended by or

exist in itself. A little attention will discover to any one the truth

and evidence of what is here said, and make it unnecessary to insist on

any other proofs against the existence of material substance.

24. THE ABSOLUTE EXISTENCE OF UNTHINKING THINGS ARE

WORDS WITHOUT

A MEANING.--It is very obvious, upon the least inquiry into our thoughts,

to know whether it is possible for us to understand what is meant by the

ABSOLUTE EXISTENCE OF SENSIBLE OBJECTS IN THEMSELVES, OR

WITHOUT THE MIND.

To me it is evident those words mark out either a direct contradiction, or

else nothing at all. And to convince others of this, I know no readier or

fairer way than to entreat they would calmly attend to their own

thoughts; and if by this attention the emptiness or repugnancy of those

expressions does appear, surely nothing more is requisite for the

conviction. It is on this therefore that I insist, to wit, that the

ABSOLUTE existence of unthinking things are words without a meaning, or

which include a contradiction. This is what I repeat and inculcate, and

earnestly recommend to the attentive thoughts of the reader.

25. THIRD ARGUMENT.[Note: Vide sect. iii. and vii.]--

REFUTATION

OF LOCKE.--All our ideas, sensations, notions, or the things which we

perceive, by whatsoever names they may be distinguished, are visibly

inactive--there is nothing of power or agency included in them. So that

ONE IDEA or object of thought CANNOT PRODUCE or make ANY

ALTERATION IN

ANOTHER. To be satisfied of the truth of this, there is nothing else

requisite but a bare observation of our ideas. For, since they and every

part of them exist only in the mind, it follows that there is nothing in

them but what is perceived: but whoever shall attend to his ideas, whether

of sense or reflexion, will not perceive in them any power or activity;

there is, therefore, no such thing contained in them. A little

attention will discover to us that the very being of an idea implies

passiveness and inertness in it, insomuch that it is impossible for an

idea to do anything, or, strictly speaking, to be the cause of anything:

neither can it be the resemblance or pattern of any active being, as is

evident from sect. 8. Whence it plainly follows that extension,

figure, and motion cannot be the cause of our sensations. To say,

therefore, that these are the effects of powers resulting from the

configuration, number, motion, and size of corpuscles, must certainly

be false. [Note: Vide sect. cii.]

26. CAUSE OF IDEAS.--We perceive a continual succession of ideas, some are

anew excited, others are changed or totally disappear.

There is therefore

some cause of these ideas, whereon they depend, and which produces and

changes them. That this cause cannot be any quality or idea or combination

of ideas, is clear from the preceding section. It must therefore be a

substance; but it has been shown that there is no corporeal or material

substance: it remains therefore that the CAUSE OF IDEAS

is an incorporeal

active substance or Spirit.

27. NO IDEA OF SPIRIT.--A spirit is one simple, undivided, active

being--as it perceives ideas it is called the UNDERSTANDING, and as it

produces or otherwise operates about them it is called the WILL. Hence

there can be no idea formed of a soul or spirit; for all ideas whatever,

being passive and inert (vide sect. 25), they cannot represent unto us,

by way of image or LIKENESS, that which acts. A little attention will make

it plain to any one, that to have an idea which shall be like that active

principle of motion and change of ideas is absolutely impossible. Such is

the nature of SPIRIT, or that which acts, that it cannot be of itself

perceived, BUT ONLY BY THE EFFECTS WHICH IT PRODUCETH.

If any man shall

doubt of the truth of what is here delivered, let him but reflect and try

if he can frame the idea of any power or active being, and whether he has

ideas of two principal powers, marked by the names WILL

and UNDERSTANDING,

distinct from each other as well as from a third idea of Substance or

Being in general, with a relative notion of its supporting or being the

subject of the aforesaid powers--which is signified by the name SOUL or

SPIRIT. This is what some hold; but, so far as I can see, the words

WILL [Note: "Understanding, mind."--Edit 1710.], SOUL, SPIRIT, do not stand

for different ideas, or, in truth, for any idea at all, but for something

which is very different from ideas, and which, being an agent, cannot be

like unto, or represented by, any idea whatsoever.

Though it must be owned

at the same time that we have some notion of soul, spirit, and the

operations of the mind: such as willing, loving, hating-

-inasmuch as we

know or understand the meaning of these words.

28. I find I can excite ideas in my mind at pleasure, and vary and shift

the scene as oft as I think fit. It is no more than willing, and

straightway this or that idea arises in my fancy; and by the same power

it is obliterated and makes way for another. This making and unmaking of

ideas doth very properly denominate the mind active.

Thus much is certain

and grounded on experience; but when we think of unthinking agents or of

exciting ideas exclusive of volition, we only amuse ourselves with words.

29. IDEAS OF SENSATION DIFFER FROM THOSE OF REFLECTION

OR MEMORY.--But,

whatever power I may have over MY OWN thoughts, I find the ideas

actually perceived by Sense have not a like dependence on my will. When

in broad daylight I open my eyes, it is not in my power to choose whether

I shall see or no, or to determine what particular objects shall present

themselves to my view; and so likewise as to the hearing and other

senses; the ideas imprinted on them are not creatures of my will. There

is THEREFORE SOME OTHER WILL OR SPIRIT that PRODUCES

THEM.

30. LAWS OF NATURE.--The ideas of Sense are more strong, lively, and

DISTINCT than those of the imagination; they have likewise a steadiness,

order, and coherence, and are not excited at random, as those which are

the effects of human wills often are, but in a regular train or series,

the admirable connexion whereof sufficiently testifies the wisdom and

benevolence of its Author. Now THE SET RULES OR

ESTABLISHED METHODS

WHEREIN THE MIND WE DEPEND ON EXCITES IN US THE IDEAS OF

SENSE, ARE CALLED

THE LAWS OF NATURE; and these we learn by experience, which teaches us

that such and such ideas are attended with such and such other ideas, in

the ordinary course of things.

31. KNOWLEDGE OF THEM NECESSARY FOR THE CONDUCT OF

WORLDLY AFFAIRS.--This

gives us a sort of foresight which enables us to regulate our

actions for the benefit of life. And without this we should be eternally

at a loss; we could not know how to act anything that might procure us

the least pleasure, or remove the least pain of sense.

That food

nourishes, sleep refreshes, and fire warms us; that to sow in the

seed-time is the way to reap in the harvest; and in general that to

obtain such or such ends, such or such means are conducive--all this we

know, NOT BY DISCOVERING ANY NECESSARY CONNEXION BETWEEN

OUR IDEAS, but

only by the observation of the settled laws of nature, without which we

should be all in uncertainty and confusion, and a grown man no more know

how to manage himself in the affairs of life than an infant just born.

32. And yet THIS consistent UNIFORM WORKING, which so evidently displays

the goodness and wisdom of that Governing Spirit whose Will constitutes

the laws of nature, is so far from leading our thoughts to Him, that it

rather SENDS THEM A WANDERING AFTER SECOND CAUSES. For, when we perceive

certain ideas of Sense constantly followed by other ideas and WE KNOW

THIS IS NOT OF OUR OWN DOING, we forthwith attribute power and agency to

the ideas themselves, and make one the cause of another, than which

nothing can be more absurd and unintelligible. Thus, for example, having

observed that when we perceive by sight a certain round luminous figure

we at the same time perceive by touch the idea or sensation called HEAT,

we do from thence conclude the sun to be the cause of heat. And in like

manner perceiving the motion and collision of bodies to be attended with

sound, we are inclined to think the latter the effect of the former.

33. OF REAL THINGS AND IDEAS OR CHIMERAS.--The ideas imprinted on the

Senses by the Author of nature are called REAL THINGS; and those

excited in the imagination being less regular, vivid, and constant,

are more properly termed IDEAS, or IMAGES OF THINGS, which they

copy and represent. But then our sensations, be they never so vivid

and distinct, are nevertheless IDEAS, that is, they exist in the

mind, or are perceived by it, as truly as the ideas of its own framing.

The ideas of Sense are allowed to have more reality in them, that is, to

be more (1)STRONG, (2)ORDERLY, and (3)COHERENT than the creatures of the

mind; but this is no argument that they exist without the mind. They are

also (4)LESS DEPENDENT ON THE SPIRIT [Note: Vide sect.

xxix.--Note.],

or thinking substance which perceives them, in that they are excited by

the will of another and more powerful spirit; yet still they are IDEAS,

and certainly no IDEA, whether faint or strong, can exist otherwise than

in a mind perceiving it.

34. FIRST GENERAL OBJECTION.--ANSWER.--Before we proceed any farther

it is necessary we spend some time in answering objections which

may probably be made against the principles we have hitherto laid

down. In doing of which, if I seem too prolix to those of quick

apprehensions, I hope it may be pardoned, since all men do not

equally apprehend things of this nature, and I am willing to be

understood by every one.

FIRST, then, it will be objected that by the foregoing principles ALL

THAT IS REAL AND SUBSTANTIAL IN NATURE IS BANISHED OUT

OF THE WORLD, and

instead thereof a chimerical scheme of id